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May 2002

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Subject:
From:
"Kasprzak, Bill (sys) USX" <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Mon, 20 May 2002 07:01:49 -0400
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Seth,

I know I sound like a broken record but,

crimping is just that, crimping. If you find it necessary to add solder or
even compelled to add solder, then change your connection from a crimp
design to a solder design. So, all these consequential results such as
wicking causing loss of strain relief and the entrapment of flux cannot be
part of the equation when the connection was designed to be crimped, period.
I still maintain that if the connection that being made is supposed to be
crimped, then crimp it and be done with it. No other secondary processes
need to added. Otherwise, skip the crimping and just solder the wire. You
should not do both.

Bill Kasprzak
Moog Inc. Manufacturing Engineering, Electronics


> -----Original Message-----
> From: Seth Goodman [SMTP:[log in to unmask]]
> Sent: Sunday, May 19, 2002 2:58 PM
> To:   [log in to unmask]
> Subject:      Re: [TN] Crimped connections
>
> I agree with all that has been said, more or less.  The two key points for
> me are:
>
> 1) Tinning the wire wicks solder up the stranded wire into the insulation
> region and defeats the strain relief that wire insulation naturally gives.
>
> 2) Tinning the wire can also wick up nasty flux components that will
> eventually eat the wire for lunch.
>
> 3) Crimping is dependent on the having the right cross-sectional area of
> metals with the right modulus inside the crimp die.  The crimp dies were
> designed for copper wire, phosphor bronze terminals, etc.  This does not
> mean they won't work with tin/lead in addition to the other metals inside,
> it just means that someone has to do a lot of homework to figure this out.
> Any takers?
>
> 4) I cannot find my IPC Handbook on counting.  Someone please assist.
> This
> is beyond coffee, time to "do the Dew".
>
>
> Next time a design engineer asks why you don't tin wire before crimping,
> the
> best approach is to smile and simply say "Because".  Engineers understand
> and readily accept this answer.  I particularly appreciate it when
> manufacturing gives me this answer to a legitimate question.  It shows
> that
> they've carefully thought through problem and they know I can't do
> anything
> about it.  Did I tell you about the 200 pound Muskie I caught ice fishing
> this year?
>
> Regards,
>
> Seth Goodman
> Goodman Associates, LLC
> tel 608.833.9933
> fax 608.833.9966
>
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